Oakley Leffingwell Polarized 57mm Sunglasses - OO9100 。Grilamid is a nylon characterized by an extremely high bending strength, low density and a resistance to UV damage. So the frames are shatter-resistant, lightweight and durable. What is an 6-Base lens? A lens\' Base refers to the amount of arc in the lens and therefore the arc in the frame. A 6-Base has a more flat, square shape creating a more scholarly look. A larger base, like a 9-Base, is more wrapped and therefore will appear more suited for active endeavors. Like new •••• All Items are 100% Authentic, Inspected and Photographed/Video Tapes Prior to Shipping. DISCLAIMER: I describe all items as accurately as possible. and notate ANY flaws I may find. Matter of opinion or personal expectations DOES NOT render an item \"Not as Described\". It remains the buyer\'s responsibility to ask further questions, if in any, BEFORE purchasing an item. Pictures are considered part of description. ***PLEASE REVIEW ALL PICTURES CAREFULLY AS THEY ARE PART OF CONDITION DESCRIPTION